Worth a read:
http://blogs.cisco.com/security/talos/cryptowall-3-0
My only question is why would the dropper care whether it's running in a virtual environment? A bit more digging reveals that the malware author is assuming that if his code ends up running in a VM, it's probably a sandbox and being studied, so the malicious code refuses to co-operate. Clever.
Here's the analysis of Cryptowall 2.0, from the same blog:
blogs.cisco.com/security/talos/cryptowall-2
When innovation goes south: The tech that never quite worked out
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We don’t need new gadgets; we need to use antibiotics more sparingly.
3 hours ago
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